Earl D. Honeycutt and Thomas H. Stevenson, Evaluating Sales Training Programs. Industrial Marketing Management (август 1989). С. 215–222. См. также Fernando Jaramillo, Francois A. Carrillat, and William B. Locander. A Meta-Analytic Comparison of Managerial Ratings and Self-Evaluations. Journal of Personal Selling & Sales Management 25 (осень 2005). С. 315–328.